<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>js10.2 作业编写星级评分系统</title>
		<style type="text/css">
			body,div,ul,li,p{margin:0;padding:0;}
			body{color:#666;font:12px/1.5 Arial;}
			ul{list-style-type:none;}
			#star{position:relative;width:600px;margin:10px auto;}
			#star ul,#star span{float:left;display:inline;height:19px;line-height:19px;}
			#star ul{margin:0 10px;}
			#star li{float:left;width:24px;cursor:pointer;text-indent:-9999px;background:url(img/star.png) no-repeat;}
			#star strong{color:#f60;padding-left:10px;}
			#star li.on{background-position:0 -28px;}
			#star p{position:absolute;top:20px;width:159px;height:60px;display:none;background:url(img/icon.gif) no-repeat;padding:7px 10px 0;}
			#star p em{color:#f60;display:block;font-style:normal;}

		</style>
	</head>
	<body>
		<ul>
			<div id="star">
		    <span>点击星星就能打分</span>
		    <ul>
		        <li><a href="javascript:;">1</a></li>
		        <li><a href="javascript:;">2</a></li>
		        <li><a href="javascript:;">3</a></li>
		        <li><a href="javascript:;">4</a></li>
		        <li><a href="javascript:;">5</a></li>
		    </ul>
		    <span></span
		    <p></p>
		</div>

		</ul>
		<script type="text/javascript">
			window.onload = function (){
				var oStar = document.getElementById("star");
				var aLi = oStar.getElementsByTagName("li");
				var oUl = oStar.getElementsByTagName("ul")[0];
				var oSpan = oStar.getElementsByTagName("span")[1];
				var oP = oStar.getElementsByTagName("p")[0];
				var i = iScore = iStar = 0;
				var aMsg = ["很不满意|差得太离谱，与卖家描述的严重不符，非常不满",
							"不满意|部分有破损，与卖家描述的不符，不满意",
							"一般|质量一般，没有卖家描述的那么好",
							"满意|质量不错，与卖家描述的基本一致，还是挺满意的",
							"非常满意|质量非常好，与卖家描述的完全一致，非常满意"]
				
				for (i = 1; i <= aLi.length; i++)
				{
					aLi[i - 1].index = i;
					//鼠标移过显示分数
					aLi[i - 1].onmouseover = function ()
					{
						fnPoint(this.index);
						//浮动层显示
						oP.style.display = "block";
						//计算浮动层位置
						oP.style.left = oUl.offsetLeft + this.index * this.offsetWidth - 104 + "px";
						//匹配浮动层文字内容
						oP.innerHTML = "<em><b>" + this.index + "</b> 分 " + aMsg[this.index - 1].match(/(.+)\|/)[1] + "</em>" + aMsg[this.index - 1].match(/\|(.+)/)[1]
					};
					//鼠标离开后恢复上次评分
					aLi[i - 1].onmouseout = function ()
					{
						fnPoint();
						//关闭浮动层
						oP.style.display = "none"
					};
					//点击后进行评分处理
					aLi[i - 1].onclick = function ()
					{
						iStar = this.index;
						oP.style.display = "none";
						oSpan.innerHTML = "<strong>" + (this.index) + " 分</strong> (" + aMsg[this.index - 1].match(/\|(.+)/)[1] + ")"
					}
				}
				//评分处理
				function fnPoint(iArg)
				{
					//分数赋值
					iScore = iArg || iStar;
					for (i = 0; i < aLi.length; i++) aLi[i].className = i < iScore ? "on" : "";	
				}
			};

		</script>
	</body>
</html>
